Sagnac Interferometer Enhanced Particle Tracking in Optical Tweezers
Optics
2015-05-19 v1
Abstract
A setup is proposed to enhance tracking of very small particles, by using optical tweezers embedded within a Sagnac interferometer. The achievable signal-to-noise ratio is shown to be enhanced over that for a standard optical tweezers setup. The enhancement factor increases asymptotically as the interferometer visibility approaches 100%, but is capped at a maximum given by the ratio of the trapping field intensity to the detector saturation threshold. For an achievable visibility of 99%, the signal-to-noise ratio is enhanced by a factor of 200, and the minimum trackable particle size is 2.4 times smaller than without the interferometer.
Cite
@article{arxiv.1006.0777,
title = {Sagnac Interferometer Enhanced Particle Tracking in Optical Tweezers},
author = {M. A. Taylor and J. Knittel and M. T. L. Hsu and H. -A. Bachor and W. P. Bowen},
journal= {arXiv preprint arXiv:1006.0777},
year = {2015}
}